Grade 6 - Mathematics1.29 Criteria of Divisibility By 9

A natural number is divisible by 9 if and only if the sum of its digits is divisible by 9.Example: Is 2367 divisible by 9?
The sum of all digits in given number = 2 + 3 + 6 + 7 = 18
18 is divisible by 9. Therefore, 2367 is divisible by 9.

Example: Is 2080 divisible by 9?
The sum of all digits in given number = 2 + 0 + 8 + 0 = 10
10 is not divisible by 9. Therefore, 2080 is not divisible by 9.